I have not found anything wrong in the source code and binaries you have sent to me.

I have created a similar solution (one main file, one class library), and have embedded your license key. I was not able to reproduce the problem.

At the moment I do not see how to progress further, without a reproducible scenario. Are you sure that the customer had/has proper versions of your software, with the license in it etc.?

I have received the files via DropBox, thank you.
Regarding the code in QuickOpcLicenseManagement, in which of the two projects does it run - in the DLL, or in the UI EXE?

When you check the serial number returned, is it really your serial number, or a different one?

Thank you

Thank you for the details. Yes, there should be not other action needed on the target machine, when the license is properly stored in MRLS.

Can you post here the piece of code from your project that does the license registration, including the beginning of the file (so that I can see the namespace declarations), and the actual executable (zipped; just the EXE, no additional files)? If you do not want to post it here, I will give you FTP site to upload to, or you can use Dropbox or similar service and send me the link by email, to support09(at)opclabs.com .

I do not want to run the application at the moment, that's why no other files or instructions are needed; I just want to examine it using ILDASM and check whether things are in their right place, in comparison to the source code registration piece.

Best regards

Hello,
regarding the "Run time is over ..." error, I have some questions:

1. Are you sure that it works on your computer? That is, have you actually *uninstalled* the registry-based license (using License Manager), and *then* tested whether the license from embedded resource kicks in?

2. Have you tested on any other computer?

3. Is that the one and only customer who has this solution at the moment? Or, are there others that do not have the problem?

4. Do you have the ability to display the serial number of the detected license (similar to the code you refereed to) in your application, so that this can be checked on the deployed system? If not, would it be possible to add it?

The second issue corresponds to 0x80004005, E_FAIL: "Unspecified error". It is not related to licensing.It most likely comes from the target OPC server.

For both issues, you should improve your error handling. Any single-operation QuickOPC method can throw OpcException (this is the case with both errors above), for reasons that you cannot always prevent from your code. Therefore, the code must handle OpcException gracefully. Multi-operation QuickOPC do not throw this exception, but instead indicate the result in the .Exception property of each result object - which should be tested and handled as well.

Best regards